Photoshop cc 3d Shadows

I have something that has been buggin me for quite a few days now. As i was going through some adobe 3d text tutorials i stumbled upon a place where i need shadows to be casted.

But every object i put and no matter how many lights n angles i cant seem to get shadows on my scene. I havent tried a full render. But it would be nice to see where the shadowa are before rendering help please.